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Service bulletin 98T27

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id603435
Published by NHTSA1999-02-22
Manufacturer's number98T27
Manufacturer's date1998-07-01
NHTSA componentENGINE AND ENGINE COOLING:ENGINE

NHTSA's summary

THIS BULLETIN ANNOUNCES THE NEW DESIGN OF THE 2-VALVE CYLINDER HEAD WHICH HAS INCORPORATED A RADIUS CHANGE UNDER THE VALVE SPRING SEAT. *TT

The document

No address for NHTSA's copy can be built for this communication. Ask the dealer for it by the manufacturer's number.

Components

Engine

Vehicles listed
CUMMINS B

Listing a model year does not mean every vehicle of it is concerned: the document says which.